The success page does not contain any modules from the core. The only problem is with this is that users can still access this page at any time and your modules would probably need to be loaded only when an order ID has been created.

The most generated errors being found on Opencart forum originates from contributed programming. The increased counters are caused by posted redundancies of the same solutions that were already provided prior.

You'd need to use the catalog/controller/common/success.php file to add the modules. Then, to output them into the success.twig file. As an alternative, you could use the Template Switcher extension from the marketplace and add the modules directly into the success.twig file.

The most generated errors being found on Opencart forum originates from contributed programming. The increased counters are caused by posted redundancies of the same solutions that were already provided prior.

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The most generated errors being found on Opencart forum originates from contributed programming. The increased counters are caused by posted redundancies of the same solutions that were already provided prior.